US20020064037A1 - Backlight unit of bi-directional irradiation for liquid crystal display device - Google Patents

Backlight unit of bi-directional irradiation for liquid crystal display device Download PDF

Info

Publication number
US20020064037A1
US20020064037A1 US09/994,129 US99412901A US2002064037A1 US 20020064037 A1 US20020064037 A1 US 20020064037A1 US 99412901 A US99412901 A US 99412901A US 2002064037 A1 US2002064037 A1 US 2002064037A1
Authority
US
United States
Prior art keywords
backlight unit
guide plate
light
light guide
fluorescent lamp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US09/994,129
Other languages
English (en)
Inventor
Pyung Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hydis Technologies Co Ltd
Original Assignee
Hyundai Display Technology Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hyundai Display Technology Inc filed Critical Hyundai Display Technology Inc
Assigned to HYUNDAI DISPLAY TECHNOLOGY, INC. reassignment HYUNDAI DISPLAY TECHNOLOGY, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LEE, PYUNG YONG
Publication of US20020064037A1 publication Critical patent/US20020064037A1/en
Assigned to BOE-HYDIS TECHNOLOGY CO., LTD. reassignment BOE-HYDIS TECHNOLOGY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HYUNDAI DISPLAY TECHNOLOGY, INC.
Abandoned legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133342—Constructional arrangements; Manufacturing methods for double-sided displays

Definitions

  • the present invention relates generally to a backlight unit used for a liquid crystal display (LCD) device. More particularly, the present invention relates to a backlight unit capable of bi-directional irradiation, which can simultaneously irradiate light emitted to a light guide plate to both LCD panels disposed on and under the light guide plate.
  • LCD liquid crystal display
  • the LCD device is a typical one of electronic display devices.
  • the LCD device is lighter, thinner, smaller and less power consumptive than a cathode ray tube (CRT) widely known and used as another representative display device.
  • CRT cathode ray tube
  • the LCD device is not a light-emitting element.
  • An additional light source is therefore required behind an LCD panel so as to form a visual image on a screen of the LCD panel.
  • a backlight unit employing a fluorescent lamp has been used as the light source for the LCD device.
  • FIG. 1 is a cross-sectional view showing the conventional backlight unit
  • FIG. 2 is a perspective view showing two examples of a light guide plate in the conventional backlight unit
  • FIG. 3 illustrates the workings of the light guide plate in the conventional backlight unit.
  • the conventional backlight unit has two fluorescent lamps 2 formed in the vicinity of both ends of an LCD panel 20 so as to irradiate light to the LCD panel 20 .
  • Outer periphery of each fluorescent lamp 2 is surrounded by a lamp reflector 6 .
  • the confronting lamp reflectors 6 reflect light irradiated by the fluorescent lamps 2 toward a space therebetween.
  • the light guide plate 4 is dispsoed in the space, closely connected with the fluorescent lamps 2 at both lateral ends thereof, and spaced apart from a backside of the LCD panel 20 .
  • the light guide plate 4 uniformly scatters light reflected by the lamp reflectors 6 , thus forming a surface light on its entire upper surface facing to the LCD panel 20 .
  • the light guide plate 4 has printed or V-cut patterns 4 a formed on its lower surface. Light incident upon the patterns 4 a is upwardly reflected and then forms the surface light on the upper surface of the light guide plate 4 .
  • the upper surface of the light guide plate 4 is wholly contacted with a diffusion plate 10 , while an opposite lower surface of the light guide plate 4 is attached to a reflecting plate 8 .
  • the reflecting plate 8 not only prevents light emitted into the light guide plate 4 from leaking downward, but also reflects light to the upper surface of the light guide plate 4 .
  • the diffusion plate 10 which is composed of at least one layer, serves to enhance the uniformity of light incident upon the LCD panel 20 .
  • inner and outer prism plates 12 and 14 are configured over the diffusion plate 10 so as to change a path of light by 90 degrees and 180 degrees.
  • both prism plates 12 and 14 are not necessary to the conventional backlight unit.
  • a cover plate 16 is disposed over the outer prism plate 14 .
  • the cover plate 16 not only protects the outer prism plate 14 , in which grooves of triangular or hemispherical shape are formed, from environmental damage, but also enhances the uniformity of light incident upon the LCD panel 20 .
  • the above-described elements of the backlight unit are wholly assembled and supported to a mold frame 18 .
  • the confronting lamp reflectors 6 reflect light generated from the fluorescent lamps 2 . Then the reflected light forms the surface light on the upper surface of the light guide plate 4 by means of the patterns 4 a of the light guide plate 4 . That is, light emitted into the light guide plate 4 is uniformly scattered by the patterns 4 a , while being prevented from leaking downward by the reflecting plate 8 .
  • the surface light is provided to the LCD panel 20 through the diffusion plate 10 so as to produce a specific image on the screen of the LCD panel 20 . That is, the scattered light by the patterns 4 a is further uniformalized by the diffusion plate 10 , then changes its path while passing through the prism plates 12 and 14 , and then perpendicularly strikes the LCD panel 20 .
  • the conventional backlight unit provides uni-directional irradiation. So, when there is a need for a backlight unit capable of bi-directional irradiation, the conventional technology may adopt two light guide plates and intervening reflecting plate. Such a conventional backlight unit of bi-directional irradiation should, however, meet increases in volume and weight due to the use of two light guide plates and the reflecting plate. Unfortunately, this may reduce the effect of bi-directional irradiation and give rise to a disadvantage over the conventional type of uni-directional irradiation.
  • a backlight unit of bi-directional irradiation having a plurality of hole patterns formed in a light guide plate.
  • the backlight unit according to the present invention used for upper and lower liquid crystal display (LCD) panels, comprises at least one fluorescent lamp which is accommodated in a mold frame so as to generate light, at least one lamp reflector which surrounds the fluorescent lamp so as to reflect the light generated from the fluorescent lamp, the light guide plate which is disposed between the upper and lower LCD panels and near the fluorescent lamp and which has the plurality of hole patterns formed on a central horizontal plane thereof and in which the hole patterns produce a bi-directional surface light in upward and downward directions by scattering the light reflected from the lamp reflector, and upper and lower diffusion plates each of which is disposed between the light guide plate and each LCD panel so as to uniformalize the bi-directional surface light produced from the light guide plate.
  • the light guide plate which is disposed between the upper and lower LCD panels and near the fluorescent lamp and which has the plurality of hole patterns formed on a central horizontal plane thereof and in which the hole patterns produce a bi-directional surface light in upward and downward directions by scattering the light reflected from the lamp reflector
  • upper and lower diffusion plates
  • the hole patterns of the light guide plate may be spaced apart from each other and arranged lengthwise and breadthwise over the central horizontal plane in the light guide plate.
  • Each of the hole patterns may have a cross-section of circular or polygonal form.
  • the hole patterns may have cross-sections of different diameters or may be distributed with different densities.
  • the backlight unit according to the present invention may further comprise upper and lower prism plates each of which is disposed between each diffusion plate and each LCD panel, and upper and lower cover plates each of which is disposed between each prism plate and each LCD panel.
  • FIG. 1 is a cross-sectional view showing a conventional backlight unit.
  • FIG. 2 is a perspective view showing two examples of a light guide plate in a conventional backlight unit.
  • FIG. 3 illustrates the workings of a light guide plate in a conventional backlight unit.
  • FIG. 4 is a cross-sectional view showing a backlight unit of bi-directional irradiation according to an embodiment of the present invention.
  • FIG. 5 is a perspective view showing a light guide plate in a backlight unit of bi-directional irradiation according to an embodiment of the present invention.
  • FIG. 6 illustrates the workings of a light guide plate in a backlight unit of bi-directional irradiation according to an embodiment of the present invention.
  • FIG. 7 illustrates two examples of hole patterns of a light guide plate in a backlight unit of bi-directional irradiation according to an embodiment of the present invention.
  • FIG. 4 is a cross-sectional view showing a backlight unit of bi-directional irradiation according to an embodiment of the present invention
  • FIG. 5 is a perspective view showing a light guide plate in a backlight unit of bi-directional irradiation according to an embodiment of the present invention.
  • the backlight unit 100 is configured to provide simultaneous bi-directional irradiation to upper and lower LCD panels 118 and 128 , while employing a single light guide plate 104 .
  • the light guide plate 104 is disposed between the LCD panels 118 and 128 so as to simultaneously emit light to the LCD panels 118 and 128 .
  • the simultaneous emission of light is made possible by a plurality of hole patterns 114 a of the light guide plate 104 .
  • the hole patterns 114 a are formed on a central horizontal plane, which imaginarily or substantially divides the light guide plate 104 into upper and lower parts.
  • the hole patterns 114 a are spaced apart from each other and arranged lengthwise and breadthwise over the central horizontal plane.
  • the backlight unit 100 has at least one, preferably two, fluorescent lamp 102 formed contiguously to at least one, preferably both, lateral end of the light guide plate 104 .
  • a lamp reflector 106 surrounds the fluorescent lamp 102 .
  • the lamp reflector 106 reflects light irradiated by the fluorescent lamp 102 toward the light guide plate 104 .
  • Each diffusion plate 110 or 120 which is composed of at least one layer, serves to enhance the uniformity of light incident upon the LCD panel 118 or 128 .
  • upper and lower inner prism plates 112 and 122 are formed respectively on external surfaces of the diffusion plates 110 and 120 , and upper and lower outer prism plates 114 and 124 are also formed thereto.
  • the prism plates 112 , 114 , 122 and 124 serve to change a path of light by 90 degrees and 180 degrees. If necessary, inner or outer prism plate only may be used. Alternatively, if possible, no prism plate may be used.
  • upper and lower cover plates 116 and 126 are disposed respectively over the outer prism plates 114 and 124 .
  • the cover plates 116 and 126 protect the outer prism plates 114 and 124 , each of which has grooves of triangular or hemispherical shape. Also, the cover plates 116 and 126 serve to enhance the uniformity of light incident upon the LCD panels 118 and 128 .
  • the diffusion plates 110 and 120 , the inner prism plates 112 and 122 , the outer prism plates 114 and 124 , and the cover plates 116 and 126 are sequentially stacked on and under the single light guide plate 104 , while corresponding plates being symmetric with respect to the light guide plate 104 .
  • These plates are wholly assembled and supported to a mold frame 108 .
  • FIG. 6 illustrates the workings of the light guide plate 104 .
  • the fluorescent lamp 102 when the fluorescent lamp 102 generates light, the generated light is reflected by the lamp reflector 106 and then enters the light guide plate 104 . Subsequently, the incident light is uniformly scattered by the hole patterns 104 a in the light guide plate 104 , so that the scattered light produces bi-directional surface light in upward and downward directions on upper and lower surfaces of the light guide plate 104 .
  • the bi-directional surface light emitted from the upper and lower surfaces of the light guide plate 104 is further uniformalized by the diffusion plates 110 and 120 , and then changes its path while passing through the prism plates 112 , 114 , 122 and 124 .
  • the light with changed path penetrates the cover plates 116 and 126 , and then perpendicularly strikes the LCD panels 118 and 128 so as to produce a specific image on the screen of each LCD panel 118 or 128 .
  • FIG. 7 illustrates two examples of the hole patterns 104 a of the light guide plate 104 .
  • the hole patterns 104 a can have cross-sections of different diameters.
  • the hole patterns 104 a can be distributed with different densities. That is, the adjacent hole patterns 104 a can have different intervals.
  • the hole patterns 104 a can be formed by utilizing mechanical, laser or hydraulic force.
  • each hole pattern 104 a has a cross-section of circular or polygonal form.
  • the uniformity in the backlight unit can be adjusted, and the strength of light can be differently regulated in upward and downward directions.
  • the backlight unit of bi-directional irradiation according to the present invention has several advantages. For example, since the present invention uses the only single light guide plate and no conventional reflecting plate to realize bi-directional irradiation, the backlight unit of the present invention becomes simpler, thinner and more economical.
US09/994,129 2000-11-25 2001-11-26 Backlight unit of bi-directional irradiation for liquid crystal display device Abandoned US20020064037A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020000070703A KR20020040989A (ko) 2000-11-25 2000-11-25 양면광 출력형 백라이트 유닛
KR2000-70703 2000-11-25

Publications (1)

Publication Number Publication Date
US20020064037A1 true US20020064037A1 (en) 2002-05-30

Family

ID=19701488

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/994,129 Abandoned US20020064037A1 (en) 2000-11-25 2001-11-26 Backlight unit of bi-directional irradiation for liquid crystal display device

Country Status (5)

Country Link
US (1) US20020064037A1 (ja)
JP (1) JP3785453B2 (ja)
KR (1) KR20020040989A (ja)
CN (1) CN1184515C (ja)
TW (1) TW539889B (ja)

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003032058A1 (en) * 2001-10-11 2003-04-17 Deep Video Imaging Limited Visual display unit illumination
US20040183972A1 (en) * 2001-04-20 2004-09-23 Bell Gareth Paul Optical retarder
US20040189892A1 (en) * 2003-03-27 2004-09-30 Nec Lcd Technologies, Ltd Backlight unit in a liquid crystal display device
US20050063055A1 (en) * 2001-09-11 2005-03-24 Engel Damon Gabriel Instrumentation
WO2005071474A2 (en) * 2004-01-20 2005-08-04 Sharp Kabushiki Kaisha Directional backlight and multiple view display device
US20060001795A1 (en) * 2004-06-30 2006-01-05 Kim Young M Flat type fluorescent lamp and liquid crystal display device having the same
US20060007706A1 (en) * 2004-07-06 2006-01-12 Chun-Yuan Chen Back light module for use in a dual-sided display
US20060103951A1 (en) * 2002-03-17 2006-05-18 Bell Gareth P Method to control point spread function of an image
US20060120110A1 (en) * 2004-12-03 2006-06-08 Innolux Display Corp. Light guide plate and method for manufacturing the same
US20060146564A1 (en) * 2004-12-30 2006-07-06 Innolux Display Corp Light guide plate with holes
US20060191177A1 (en) * 2002-09-20 2006-08-31 Engel Gabriel D Multi-view display
US20060203514A1 (en) * 2005-03-09 2006-09-14 K-Bridge Electronics Co., Ltd. Light guide plate structure
US20060203518A1 (en) * 2005-03-09 2006-09-14 K-Bridge Electronics Co., Ltd. Light guide plate structure of backlight module
US20060284574A1 (en) * 2003-05-21 2006-12-21 Emslie James S Backlighting system for display screen
US20060290594A1 (en) * 2002-07-15 2006-12-28 Engel Gabriel D Multilayer video screen
US20060291248A1 (en) * 2005-06-14 2006-12-28 Tai-Cherng Yu Light guide plate and related display device
US20070052659A1 (en) * 2003-05-22 2007-03-08 Wolfgang Eckhardt Arrangement comprising a panel pertaining to a flat screen
US20080043490A1 (en) * 2005-09-09 2008-02-21 Fusion Optix Inc. Enhanced Light Guide
WO2008020684A1 (en) * 2006-08-17 2008-02-21 Lg Innotek Co., Ltd Display device and mobile terminal having the same
WO2008036508A1 (en) * 2006-09-21 2008-03-27 Motorola Inc. Double-sided backlight and assembly incorporating a double-sided light source coupling light guide
US20080152842A1 (en) * 2000-11-17 2008-06-26 Pure Depth Limited Altering surfaces of display screens
US20090051623A1 (en) * 2007-08-22 2009-02-26 Paul Gareth P Method and system for determining a position for an interstital diffuser for use in a multi-layer display
US20100171904A1 (en) * 2009-01-06 2010-07-08 Mau-Yuan Hung Backlight Module and Double-Sided Liquid Crystal Display Device
US20110234943A1 (en) * 2010-03-23 2011-09-29 Doo-Won Lee Dual liquid crystal display
US20130063326A1 (en) * 2011-03-02 2013-03-14 Christopher K. Riegel Translucent Digital Display System
US8773614B2 (en) 2011-01-03 2014-07-08 Lg Display Co., Ltd. Two-way liquid crystal display device
DE102004038344B4 (de) * 2003-08-08 2015-04-30 Citizen Electronics Company Limited Doppelseitige Beleuchtungsvorrichtung
US9028127B2 (en) 2011-05-27 2015-05-12 Lg Innotek Co., Ltd. Lighting module
US20150370129A1 (en) * 2014-06-24 2015-12-24 Shenzhen China Star Optoelectronics Technology Co. Ltd. Direct-type backlight module unit of dual-side liquid crystal display device
US20170017122A1 (en) * 2015-07-15 2017-01-19 Shenzhen China Star Optoelectronics Technology Co. Ltd. Double-sided display
US9881528B2 (en) 2011-10-13 2018-01-30 Manufacturing Resources International, Inc. Transparent liquid crystal display on display case
US9983427B2 (en) 2014-06-16 2018-05-29 Manufacturing Resources International, Inc. Sealed transparent liquid crystal display assembly
US10182665B2 (en) 2014-10-15 2019-01-22 Manufacturing Resources International, Inc. System and method for preventing damage to products
WO2019059916A1 (en) * 2017-09-22 2019-03-28 Corning Incorporated BACKLIGHT UNIT AND ELECTRONIC DISPLAY
US10269038B2 (en) 2014-06-16 2019-04-23 Manufacturing Resources International, Inc. System for tracking and analyzing consumption
US10455671B2 (en) 2014-10-09 2019-10-22 Manufacturing Resources International, Inc. System and method for decreasing energy usage of a transparent display case
US10467844B2 (en) 2016-03-02 2019-11-05 Manufacturing Resources International, Inc. Vending machines having a transparent display
US10692407B2 (en) 2016-07-08 2020-06-23 Manufacturing Resources International, Inc. Mirror having an integrated electronic display
US10705288B2 (en) 2014-06-16 2020-07-07 Manufacturing Resources International, Inc. Thermal management system for a transparent electronic display located in an access panel of a display case
US20220317520A1 (en) * 2021-03-30 2022-10-06 Japan Display Inc. Display system
US11474393B2 (en) 2014-10-08 2022-10-18 Manufacturing Resources International, Inc. Lighting assembly for electronic display and graphic

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100396434B1 (ko) * 2001-09-03 2003-09-02 주식회사 엘에스텍 도광판용 패턴형성장치
JP4011544B2 (ja) 2001-09-28 2007-11-21 シチズンホールディングス株式会社 液晶表示装置
KR100445670B1 (ko) * 2001-11-30 2004-08-21 아이에스하이텍 주식회사 듀얼 백 라이트 장치
KR100432009B1 (ko) * 2001-12-03 2004-05-22 주식회사 팬택 이동형 정보통신 기기용 양방향 디스플레이형 액정표시장치
JP2003185994A (ja) * 2001-12-14 2003-07-03 Nanox Corp 液晶表示装置
KR100465014B1 (ko) * 2002-05-11 2005-01-06 주식회사 엘에스텍 도광판용 패턴형성장치
KR100867727B1 (ko) * 2002-07-22 2008-11-10 삼성전자주식회사 백라이트 어셈블리 및 이를 갖는 화상 표시 장치
KR100828531B1 (ko) * 2002-07-26 2008-05-13 삼성전자주식회사 액정 표시 장치
KR100500044B1 (ko) * 2002-10-16 2005-07-07 경상대학교산학협력단 도광판 내부 패턴 가공 방법 및 이 방법에 의해 제작된도광판
KR100474762B1 (ko) * 2002-11-15 2005-03-11 주식회사 팬택 양방향 디스플레이형 액정표시장치
JP4012048B2 (ja) * 2002-11-15 2007-11-21 日立マクセル株式会社 面状光源及びこれを用いた液晶表示装置
KR100927015B1 (ko) * 2002-12-11 2009-11-16 엘지디스플레이 주식회사 양면 디스플레이용 백라이트 유니트와 그의 제조장치와이를 이용한 양면 디스플레이용 액정표시장치
CN1301434C (zh) * 2003-06-18 2007-02-21 友达光电股份有限公司 双面式背光组件和液晶显示装置
JP4017039B2 (ja) * 2003-11-18 2007-12-05 シャープ株式会社 照明装置およびそれを備えた表示装置
US7683865B2 (en) 2003-12-29 2010-03-23 Lg Display Co., Ltd. Detachable liquid crystal display device
KR100989248B1 (ko) 2004-01-15 2010-10-20 엘지디스플레이 주식회사 듀얼 프론트 라이트를 이용한 듀얼 액정표시장치
CN1301433C (zh) * 2004-04-07 2007-02-21 友达光电股份有限公司 背光模块
KR100595675B1 (ko) 2004-06-22 2006-07-03 엘지전자 주식회사 듀얼 엘씨디의 백라이트 장치
KR100728060B1 (ko) * 2005-11-01 2007-06-13 (주)코이즈 도광판 개선 구조
KR101318249B1 (ko) * 2007-03-06 2013-10-16 엘지디스플레이 주식회사 백라이트 유닛 및 이를 이용한 액정표시장치
CN101344610B (zh) * 2007-07-12 2011-06-29 鸿富锦精密工业（深圳）有限公司 背光模组及其光学板
JP5401247B2 (ja) * 2009-10-02 2014-01-29 日立コンシューマエレクトロニクス株式会社 バックライトユニットおよびそれを用いた映像表示装置
JP4985787B2 (ja) * 2010-01-12 2012-07-25 オムロン株式会社 面光源装置及び液晶表示装置
CN102374497A (zh) * 2010-08-17 2012-03-14 海洋王照明科技股份有限公司 一种导光板和led光源组件
KR101942786B1 (ko) * 2011-12-15 2019-01-29 엘지디스플레이 주식회사 양방향 디스플레이 장치
CN103376588B (zh) 2012-04-11 2016-01-27 联想(北京)有限公司 双屏显示装置、双屏显示方法和电子设备
CN103792615A (zh) * 2014-01-23 2014-05-14 深圳市华星光电技术有限公司 一种导光板及液晶显示装置
JP2015194628A (ja) * 2014-03-31 2015-11-05 シャープ株式会社 両面表示装置、照明装置及び導光板
JP6451979B2 (ja) * 2014-10-11 2019-01-16 Ｔｉａｎｍａ Ｊａｐａｎ株式会社 表示素子およびそれを用いた携帯型情報装置
KR102482531B1 (ko) * 2014-11-28 2022-12-30 서울바이오시스 주식회사 Led를 이용한 양면 면광원 장치
US9753204B2 (en) * 2015-08-26 2017-09-05 Wistron Corporation Electronic device
CN106291799B (zh) * 2016-09-23 2019-11-01 京东方科技集团股份有限公司 导光膜片及其制作方法和设备、背光模组和显示装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07120623A (ja) * 1993-10-25 1995-05-12 Ohtsu Tire & Rubber Co Ltd :The 面状発光体
JPH09236801A (ja) * 1996-02-29 1997-09-09 Toshiba Corp 液晶表示装置
US5856819A (en) * 1996-04-29 1999-01-05 Gateway 2000, Inc. Bi-directional presentation display
FI104658B (fi) * 1997-05-26 2000-03-15 Nokia Mobile Phones Ltd Kahden näytön näyttöjärjestely ja päätelaite
KR100248586B1 (ko) * 1997-10-28 2000-03-15 구자홍 두화면 액정 표시장치
JP3999867B2 (ja) * 1998-02-16 2007-10-31 シチズンホールディングス株式会社 液晶表示装置
KR100307027B1 (ko) * 1999-06-17 2001-11-01 서평원 액정 표시장치 및 이것을 이용한 이동 통신 단말기의 표시장치

Cited By (84)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8154691B2 (en) 2000-11-17 2012-04-10 Pure Depth Limited Altering surfaces of display screens
US20080152842A1 (en) * 2000-11-17 2008-06-26 Pure Depth Limited Altering surfaces of display screens
US20040183972A1 (en) * 2001-04-20 2004-09-23 Bell Gareth Paul Optical retarder
US20100201921A1 (en) * 2001-04-20 2010-08-12 Pure Depth Limited Optical retarder
US7742124B2 (en) 2001-04-20 2010-06-22 Puredepth Limited Optical retarder
US20090070709A1 (en) * 2001-09-11 2009-03-12 Pure Depth Limited Improvement to instrumentation
US20050063055A1 (en) * 2001-09-11 2005-03-24 Engel Damon Gabriel Instrumentation
US8149353B2 (en) 2001-10-11 2012-04-03 Puredepth Limited Visual display unit illumination
US10262450B2 (en) 2001-10-11 2019-04-16 Pure Depth Limited Display interposing a physical object within a three-dimensional volumetric space
US20050062410A1 (en) * 2001-10-11 2005-03-24 Bell Gareth Paul Visual display unit illumination
US9721378B2 (en) 2001-10-11 2017-08-01 Pure Depth Limited Display interposing a physical object within a three-dimensional volumetric space
US8687149B2 (en) 2001-10-11 2014-04-01 Pure Depth Limited Visual display unit illumination
WO2003032058A1 (en) * 2001-10-11 2003-04-17 Deep Video Imaging Limited Visual display unit illumination
US20060103951A1 (en) * 2002-03-17 2006-05-18 Bell Gareth P Method to control point spread function of an image
US20110188134A1 (en) * 2002-03-17 2011-08-04 Pure Depth Limited Method and system for controlling point spread of an object
US7742239B2 (en) 2002-03-17 2010-06-22 Puredepth Limited Method to control point spread function of an image
US20060290594A1 (en) * 2002-07-15 2006-12-28 Engel Gabriel D Multilayer video screen
US9137525B2 (en) 2002-07-15 2015-09-15 Pure Depth Limited Multilayer video screen
US20060191177A1 (en) * 2002-09-20 2006-08-31 Engel Gabriel D Multi-view display
US8146277B2 (en) 2002-09-20 2012-04-03 Puredepth Limited Multi-view display
US7106394B2 (en) 2003-03-27 2006-09-12 Nec Lcd Technologies, Ltd. Backlight unit in a liquid crystal display device
US20040189892A1 (en) * 2003-03-27 2004-09-30 Nec Lcd Technologies, Ltd Backlight unit in a liquid crystal display device
US20060284574A1 (en) * 2003-05-21 2006-12-21 Emslie James S Backlighting system for display screen
US7439683B2 (en) 2003-05-21 2008-10-21 Pure Depth Limited Backlighting system for display screen
US20070052659A1 (en) * 2003-05-22 2007-03-08 Wolfgang Eckhardt Arrangement comprising a panel pertaining to a flat screen
US7796113B2 (en) 2003-05-22 2010-09-14 Eizo Gmbh Arrangement having a flat screen panel illuminated with a back light that compensates for changes in luminance of the panel
DE102004038344B8 (de) * 2003-08-08 2015-07-23 Citizen Electronics Co., Ltd. Doppelseitige Beleuchtungsvorrichtung
DE102004038344B4 (de) * 2003-08-08 2015-04-30 Citizen Electronics Company Limited Doppelseitige Beleuchtungsvorrichtung
WO2005071474A2 (en) * 2004-01-20 2005-08-04 Sharp Kabushiki Kaisha Directional backlight and multiple view display device
US20090040426A1 (en) * 2004-01-20 2009-02-12 Jonathan Mather Directional backlight, a multiple view display and a multi-direction display
WO2005071474A3 (en) * 2004-01-20 2006-02-23 Sharp Kk Directional backlight and multiple view display device
US8154686B2 (en) 2004-01-20 2012-04-10 Sharp Kabushiki Kaisha Directional backlight, a multiple view display and a multi-direction display
CN100390635C (zh) * 2004-06-30 2008-05-28 Lg.菲利浦Lcd株式会社 平板型荧光灯以及具有该荧光灯的液晶显示器件
US20060001795A1 (en) * 2004-06-30 2006-01-05 Kim Young M Flat type fluorescent lamp and liquid crystal display device having the same
US7859183B2 (en) 2004-06-30 2010-12-28 Lg Display Co., Ltd. Flat light emitting lamp capable of emitting light from the side thereof and liquid crystal display device having the same
US20060007706A1 (en) * 2004-07-06 2006-01-12 Chun-Yuan Chen Back light module for use in a dual-sided display
US7150557B2 (en) * 2004-07-06 2006-12-19 Au Optronics Corp Back light module for use in a dual-sided display
US20060120110A1 (en) * 2004-12-03 2006-06-08 Innolux Display Corp. Light guide plate and method for manufacturing the same
US7303338B2 (en) * 2004-12-30 2007-12-04 Innocom Technology (Shenzhen) Co., Ltd. Light guide plate with holes
US20060146564A1 (en) * 2004-12-30 2006-07-06 Innolux Display Corp Light guide plate with holes
US20060203514A1 (en) * 2005-03-09 2006-09-14 K-Bridge Electronics Co., Ltd. Light guide plate structure
US7220042B2 (en) * 2005-03-09 2007-05-22 K-Bridge Electronics Co., Ltd. Light guide plate structure of backlight module
US20060203518A1 (en) * 2005-03-09 2006-09-14 K-Bridge Electronics Co., Ltd. Light guide plate structure of backlight module
US20060291248A1 (en) * 2005-06-14 2006-12-28 Tai-Cherng Yu Light guide plate and related display device
US20080043490A1 (en) * 2005-09-09 2008-02-21 Fusion Optix Inc. Enhanced Light Guide
US20090140962A1 (en) * 2006-08-17 2009-06-04 Hyun Ha Hwang Display Device and Mobile Terminal Having the Same
US8188954B2 (en) 2006-08-17 2012-05-29 Lg Display Co., Ltd. Display device and mobile terminal having the same
WO2008020684A1 (en) * 2006-08-17 2008-02-21 Lg Innotek Co., Ltd Display device and mobile terminal having the same
US7972051B2 (en) 2006-09-21 2011-07-05 Motorola Mobility, Inc. Double-sided backlight and assembly incorporating a double-sided light source coupling light guide
WO2008036508A1 (en) * 2006-09-21 2008-03-27 Motorola Inc. Double-sided backlight and assembly incorporating a double-sided light source coupling light guide
US8416150B2 (en) 2007-08-22 2013-04-09 Igt Method and system for determining a position for an interstital diffuser for use in a multi-layer display
US20090051623A1 (en) * 2007-08-22 2009-02-26 Paul Gareth P Method and system for determining a position for an interstital diffuser for use in a multi-layer display
US8098349B2 (en) * 2009-01-06 2012-01-17 Au Optronics Corp. Backlight module and double-sided liquid crystal display device
US20100171904A1 (en) * 2009-01-06 2010-07-08 Mau-Yuan Hung Backlight Module and Double-Sided Liquid Crystal Display Device
US8638409B2 (en) * 2010-03-23 2014-01-28 Samsung Display Co., Ltd. Dual liquid crystal display
US20110234943A1 (en) * 2010-03-23 2011-09-29 Doo-Won Lee Dual liquid crystal display
US8773614B2 (en) 2011-01-03 2014-07-08 Lg Display Co., Ltd. Two-way liquid crystal display device
US20130063326A1 (en) * 2011-03-02 2013-03-14 Christopher K. Riegel Translucent Digital Display System
US11100825B2 (en) 2011-03-02 2021-08-24 Stratacache, Inc. Translucent digital display system
US9514661B2 (en) * 2011-03-02 2016-12-06 Stratacache, Inc. Translucent digital display system
US9028127B2 (en) 2011-05-27 2015-05-12 Lg Innotek Co., Ltd. Lighting module
EP2527891B1 (en) * 2011-05-27 2016-11-23 LG Innotek Co., Ltd. Lighting module
US9964696B2 (en) 2011-05-27 2018-05-08 Lg Innotek Co., Ltd. Lighting module
US10417943B2 (en) 2011-10-13 2019-09-17 Manufacturing Resources International, Inc. Transparent liquid crystal display on display case
US9881528B2 (en) 2011-10-13 2018-01-30 Manufacturing Resources International, Inc. Transparent liquid crystal display on display case
US9983427B2 (en) 2014-06-16 2018-05-29 Manufacturing Resources International, Inc. Sealed transparent liquid crystal display assembly
US10705288B2 (en) 2014-06-16 2020-07-07 Manufacturing Resources International, Inc. Thermal management system for a transparent electronic display located in an access panel of a display case
US10269038B2 (en) 2014-06-16 2019-04-23 Manufacturing Resources International, Inc. System for tracking and analyzing consumption
US10679243B2 (en) 2014-06-16 2020-06-09 Manufacturing Resources International, Inc. System and method for tracking and analyzing consumption
US9523884B2 (en) * 2014-06-24 2016-12-20 Shenzhen China Star Optoelectronics Technology Co., Ltd Direct type backlight module unit of dual-side liquid crystal display device
US20150370129A1 (en) * 2014-06-24 2015-12-24 Shenzhen China Star Optoelectronics Technology Co. Ltd. Direct-type backlight module unit of dual-side liquid crystal display device
US11474393B2 (en) 2014-10-08 2022-10-18 Manufacturing Resources International, Inc. Lighting assembly for electronic display and graphic
US10555406B2 (en) 2014-10-09 2020-02-04 Manufacturing Resources International, Inc. System and method for decreasing energy usage of a transparent display case
US10455671B2 (en) 2014-10-09 2019-10-22 Manufacturing Resources International, Inc. System and method for decreasing energy usage of a transparent display case
US10182665B2 (en) 2014-10-15 2019-01-22 Manufacturing Resources International, Inc. System and method for preventing damage to products
US10595648B2 (en) 2014-10-15 2020-03-24 Manufacturing Resources International, Inc. System and method for preventing damage to products
US10258170B2 (en) 2014-10-15 2019-04-16 Manufacturing Resources International, Inc. System and method for controlling an electronic display
US20170017122A1 (en) * 2015-07-15 2017-01-19 Shenzhen China Star Optoelectronics Technology Co. Ltd. Double-sided display
US10409109B2 (en) * 2015-07-15 2019-09-10 Shenzhen China Star Optoelectronics Technology Co., Ltd Double-sided display
US10467844B2 (en) 2016-03-02 2019-11-05 Manufacturing Resources International, Inc. Vending machines having a transparent display
US10692407B2 (en) 2016-07-08 2020-06-23 Manufacturing Resources International, Inc. Mirror having an integrated electronic display
US11854440B2 (en) 2016-07-08 2023-12-26 Manufacturing Resources International, Inc. Mirror having an integrated electronic display
WO2019059916A1 (en) * 2017-09-22 2019-03-28 Corning Incorporated BACKLIGHT UNIT AND ELECTRONIC DISPLAY
US20220317520A1 (en) * 2021-03-30 2022-10-06 Japan Display Inc. Display system

Also Published As

Publication number Publication date
TW539889B (en) 2003-07-01
JP3785453B2 (ja) 2006-06-14
KR20020040989A (ko) 2002-05-31
CN1184515C (zh) 2005-01-12
JP2002258284A (ja) 2002-09-11
CN1356584A (zh) 2002-07-03

Similar Documents

Publication Publication Date Title
US20020064037A1 (en) Backlight unit of bi-directional irradiation for liquid crystal display device
US7837360B2 (en) Optical module
EP1493050B1 (en) Compact lighting system and display device
JP5085864B2 (ja) バックライトシステム及びそれを採用した液晶表示装置
US7278756B2 (en) Light-emitting diode and backlight system using the same
CN100422812C (zh) 液晶显示装置
CN100562686C (zh) 面光源装置
CN100403116C (zh) 背光单元
JP4702176B2 (ja) バックライト及び液晶表示装置
JP4048049B2 (ja) 面光源装置及び液晶表示装置
CN101514781A (zh) 背光单元
CN104197247A (zh) 照明系统、照明器和背光单元
JP2009289701A (ja) 照明装置、面光源装置、および液晶表示装置
TWI626482B (zh) 可切換視角的背光單元
CN102576117A (zh) 光导、照明系统、背光系统和显示设备
JP4635863B2 (ja) 面発光装置
JP2009506501A (ja) 二機能性分光器光源付直下型バックライト
US20040141104A1 (en) Surface lighting device and liquid crystal display using the same
JPWO2009145319A1 (ja) 光源装置および該光源装置を備える表示装置
KR20060115124A (ko) 균일한 광분포를 얻기 위한 광방출기 및 상기 광방출기를이용한 백라이트 유닛
JP2009070589A (ja) 液晶ディスプレイ機器
US20050088838A1 (en) Light guiding device with two opposite light emitting surfaces and backlight module using the same
JP2006164625A (ja) 照明装置、及びこれを備える表示装置
US7434975B2 (en) Backlight module with brightness enhancing structures and liquid crystal display device incorporating same
CN109118953B (zh) 一种直下式背光模组

Legal Events

Date Code Title Description
AS Assignment

Owner name: HYUNDAI DISPLAY TECHNOLOGY, INC., KOREA, REPUBLIC

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LEE, PYUNG YONG;REEL/FRAME:012326/0829

Effective date: 20011112

AS Assignment

Owner name: BOE-HYDIS TECHNOLOGY CO., LTD., KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HYUNDAI DISPLAY TECHNOLOGY, INC.;REEL/FRAME:013879/0345

Effective date: 20030303

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION